REFLECTOR: IVO Brush Modification

[John Dibble]

On 5/22/2013 2:34 PM, Michael Watson wrote:
> John,
>
>  I would think copper running on aluminum will ware a grove in the 
> aluminum rings ?
Yes.  That is a concern and why I use a solenoid to contact only when 
adjusting pitch.
> The brushes are much softer and does not ware down the rings. Also, 
> that setup should
> generate static noise in your avionics.
Haven't noticed any more noise than I already have.

John
>
> Mike W.
>
>
>
> On Wed, May 22, 2013 at 1:15 PM, John Dibble <aminetech at bluefrog.com 
> <mailto:aminetech at bluefrog.com>> wrote:
>
>     I've modified the IVO brushes using 12 gauge copper wire to
>     contact the hub rings.  A solenoid lightly presses the wires
>     against the rings when the pitch adjust switch is pressed.  The
>     white wires going to the copper wires serve as a spring to keep
>     the wires from contacting the rings when no pitch adjustment is
>     being made.  I kept the original brushes in place to keep the
>     rings clean of dirt/oil and to act as a backup in case this
>     modification fails, and to supplement current transfer.  This is
>     giving me a very rapid pitch change (100 rpm/sec).
>
>     John
>
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